176 VISCERAL ANATOMY. 



Describe the Tubuli Uriniferi. The uriniferous tubes begin at the Mai- 

 pighian corpuscles in the Capsules of Miiller, and end at the orifices on the 

 surfaces of the papillae. Their various portions are the 

 Convoluted Tubes of Ferrein, in the cortical substance. 

 Looped Ttibes of Henle, descending from the former and ascending into 



the next mentioned. 



Straight Tubes of Bellini, in the medullary substance, arranged in pyra- 

 mids, the Pyramids of Malpighi. 



What are the Pyramids of Ferrein ? They are pyramidal arrangements 

 of the tubes of Ferrein at the bases of the pyramids of Malpighi. 



What are the Malpighian Bodies ? They are small red bodies found in 

 the cortical substance, each formed by the dilated extremity of a tube of Fer- 

 rein, about the yi^ inch in diameter, and consisting of the 



Malpighian Tuft, a tuft of capillary vessels, the termination of some 



branches of the renal artery and vein.*' 

 Capsule of Mullerf the dilated extremity of a 

 tube of Ferrein, ^investing the Malpighian tuft 

 probably by two layers, similar to the pleura! 

 ^'ISL investment of the lungs. 



How is the Kidney invested ? By a dense 

 fibrous Capsule, which is continued inwards at the 

 hilum, to line the sides of the sinus and form sheaths 

 around the vessels. The kidney is also surrounded 

 by a large quantity of fat. 



Enumerate the various Divisions of the Renal 

 Vessels. They are all derived from the Renal 

 Artery and the Renal Vein, but in their course have 

 received different names, as follows, viz. 



Renal Artery, branch of the abdominal aorta. Divides into the 

 Primary Branches, 4 or 5, arising just external to the hilum, again sub- 

 divide and enter in the columns of Berlin as the Arterise Proprias Renales, 

 which form 



Arterial Arches, over the bases of the pyramids, and divide into ascend- 

 ing and descending branches. 



Interlobular Arteries, or Ascending Branches, supply the cortical sub- 

 stance, and end in the Stars of Verheyen. (See next page.) 

 Arteriolce Recta, or Descending Branches, supply the medullary pyra- 

 mids, ending in venous plexuses therein. 

 Afferent Vessels, to the Malpighian bodies, from the ascending branches. 



